US 11,891,528 B2
Powder of spherical crosslinkable polyamide particles, preparation process and use with the selective laser sintering technique
Jérome Gimenez, Bron (FR)
Assigned to SETUP Performance SAS, Frontonas (FR)
Filed by SETUP Performance SAS, Frontonas (FR)
Filed on Dec. 20, 2021, as Appl. No. 17/555,889.
Application 17/555,889 is a continuation of application No. 16/472,318, granted, now 11,236,242, previously published as PCT/FR2017/053776, filed on Dec. 21, 2017.
Claims priority of application No. 1663160 (FR), filed on Dec. 22, 2016.
Prior Publication US 2022/0112386 A1, Apr. 14, 2022
Int. Cl. C09D 11/101 (2014.01); B29B 9/12 (2006.01); C09D 11/102 (2014.01); B33Y 70/10 (2020.01); B33Y 10/00 (2015.01); B29C 64/153 (2017.01); B29K 77/00 (2006.01); B29K 105/24 (2006.01)
CPC C09D 11/101 (2013.01) [B29B 9/12 (2013.01); B33Y 70/10 (2020.01); C09D 11/102 (2013.01); B29C 64/153 (2017.08); B29K 2077/00 (2013.01); B29K 2105/24 (2013.01); B33Y 10/00 (2014.12)] 10 Claims
OG exemplary drawing
 
1. A powder of spherical particles of polyamide (I) functionalized by crosslinking functions Rt rendering it crosslinkable, wherein said crosslinking functions Rt are present at the surface and in the mass of said particles and in that said particles of crosslinkable polyamide (I) have a mean diameter d50 in the range of 20 μm to 100 μm;
wherein the crosslinking functions Rt are introduced onto a polyamide (II) by grafting, and the crosslinking functions Rt are supplied by grafting, directly onto the amine and/or carboxyl and/or amide functions of the polyamide (II), termed reactive functions Rr, of a crosslinking agent (III) with formula:
Rg-R1-Si(R2)3-a(R3)a   (III)
in which:
a=0, 1, or 2;
Rg is a grafting function that is capable of reacting with Rr;
R1 is a divalent hydrocarbon group or a covalent bond connecting Si directly to Rg;
R2 is an alkoxy or acyl group or represents a halogen, the groups R2 being identical or different when a=0 or 1;
R3 is an alkyl group, the groups R3 being identical or different when a=2;
and the crosslinking agent (III) is such that a=0, R1 is a divalent hydrocarbon group, R2 is an alkoxy group, Rg is an epoxy group.